Ingot mold



G. A. DORNIN INGOT MOLD 2 Sheets-Sheet l j'lIeTar eur Barnim l 1,620,010 March 8 1927., G. A. DO RNIN j INGOT MOLD Filed April 16, 1925 2 sheets-sheetz 35 eiiicient way of removing t 45 mold em odyin Patented Mar. 8, 1,927.

UNITED sTATEs PATENT OFFICE.

GEORGE A. DORNIN, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE GATHMANN ENGINEERING COMPANY, F BALTIMORE, MARYLAND, A CORPORATION OF MARY- LAND.

INGOT MOLD.

Application tiled April 16, 1925. Serial No. 23,586.

This invention relates to metal molds of va kind commonly used for casting steel ingots and particularly to molds of this class in which the lower part of the mold walls remade thicker `than the upper part thereof and in which the mold cavity is made of larger diameter at the top of the mold than at the bottom thereof. This is a characteristic of the Gathmann molds now in general use.

In the casting of'metal molds of the kind just referred to, it has been found that better results are obtained when the sand molds in which the metal molds. are cast, are bottom poured, the molten metal being caused l5 to rise in the sand mold until the desired size and shape is obtained'. This method of .casting ingot molds is so greatly superior to other methods that it has been generally adopted. It has, however, one defect. The

upper surface of the casting when formed is nite rough' and uneven and in suchcondiytion the mold is not suitable for v.use inasmuch as the top surface of the casting which constitutes the bottom of the ingot mold when in use will not rest properly on a stool considerably to the costpof the mold and such cost naturally goes into the cost of the ingtt and consequently into the cost ofthe stee I have found amost simple, cheap and ese objections and I do this during the process of casting the mold so that the subsequent operation of machining the moldrbottom is, rendered unnecessa The prge-rred way of carrying out my invention is illustrated inthe drawings in whch- Figure 1 is a view partly in side elevation and partl ,in vertical section of an ingot my improvements and showing howit 1s su ported., Figure 2 is a top p anview thereof.

Figure 3 shows-a vertical section of the lower part of the mold showing how it enaccompanying .50 ters the stool or support, the section being Figure 4 shows a. vertical section ofthe` In Figure 1 a mold of the Gathmann type' is indicated at A. B indicates a stool and C a truck on which the stool is. supported.

In general the mold A is of usual construction but it differs from others in the formation of its bottom wall.

It will be observed that the central part a of the bottom extends below the marginal portions b thereof andthat While the under side of the central portion is uneven, the marginal portions a e smooth and even so that the mold is held in a truly vertical position when placed on its stool. These smooth marginal portions are preferabl formed on two sides only of the mold, but t ey may extend continuously or at intervals `entirelyL- around the mold. These smooth marginal portions are produced during the process of casting.

Figures 5 and 'illustrate how the smooth and e en marginal portions are' formed in the mold during the casting operation.

A sand mold of well known construction is illustrated at D, the sand arts being shown at d and the flask or rame parts being shown at d. The ingot mold cast in the mold is shown at A. The mold is bottom cured being supplied with molten metal y a feeding device E of well known construction. The sand mold is similar in a'll respects to those heretofore used but I provide means at the top of the sand mold for producing the smooth and even marginal portions of the ingot mold before referred to. The sim lest and best way now known to me for erfdrming this function is to support on t 'e top of the sand mold two heavymetal bars F having smooth under sides. As the molten metalrises in the sand mold, it comes in contact with these bars and is chilledv thereby. In this way smooth, even. marginal parts are formed on' opposite sides of the middle portion of the bottom of the mold which extends between the bars as indicated in Figure 5. When the metal mold is ompleted, the sand mold is withdrawn and in use the metal mold is reversed and supported in the manner indicated in Figure 1.

It will be observed that the sand mold is so constructed and its core is so formed that a metal ingot mold of the big-end-up` type is produced with an opening in its bottom to receive a plug P which is generallyemployed in this class of molds to close the bottom of the mold and to provide a stripping device.

The methodof casting ingot molds herein shown and described is claimed in my divisional application, No. 54,519, filed Sept. 4, 1925.

l claim as my invention:

l. An ingot mold having a marginal portion on the under side of its lower end which is smoother and harder than the middle or central portion of the lower end of the mold, thus adapting the mold to rest. truly on a support.

2. An ingot mold Vhaving a relatively 20 hard and smooth marginal portion on the under side of its lower end and a softer relative rough central portion.

3. An 4ingot mold having a chilled relatively hard and smooth marginal portion on the under side of its lower' end and a softer relatively rough central portion.

' 4. An ingot mold having a marginal portion at its lower end on opposite sides of its central portion, which latterl is softer and rougher than the marginal portion.

5. An ingot mold having at its lower end a downwardly extending central portion having a relatively soft and rough outer end which is bounded by a harder and smoother marginal portion disposed on'opposite sides of the central portion.`

In testimony whereof, ll. havev hereunto subscribed lmy name.

Gnoncn A. Domain. 

